<template>
  <div class="home-category" @mouseleave="currentId = null">
    <ul class="menu">
      <!-- 划过的时候将当前 id 拿到 -->
      <li
        v-for="item in list"
        :key="item.id"
        @mouseenter="currentId = item.id"
        :class="{ active: currentId && currentId == item.id }"
      >
        <RouterLink :to="`/category/${item.id}`">{{ item.name }}</RouterLink>
        <!-- 二级分类 -->
        <RouterLink
          v-for="sub in item.children"
          :key="sub.id"
          :to="`/category/sub/${sub.id}`"
        >
          {{ sub.name }}
        </RouterLink>
        <!-- 还没数据时展示骨架屏 -->
        <template v-if="!item.children">
          <XtxSkeleton
            width="60px"
            height="18px"
            style="margin-right: 5px;"
            bg="rgba(255,255,255,0.2)"
          />
          <XtxSkeleton width="50px" height="18px" bg="rgba(255,255,255,0.2)" />
        </template>
      </li>
    </ul>
    <!-- 弹层 -->
    <div class="layer">
      <h4>
        {{ currentId == 'brand' ? '品牌推荐' : '分类推荐' }}
        <small>根据您的购买或浏览记录推荐</small>
      </h4>
      <ul v-if="currCategory && currCategory.goods">
        <li v-for="item in currCategory.goods" :key="item.id">
          <RouterLink to="/">
            <img :src="item.picture" />
            <div class="info">
              <p class="name ellipsis-2">{{ item.name }}</p>
              <p class="desc ellipsis">{{ item.desc }}</p>
              <p class="price">
                <i>¥</i>
                {{ item.price }}
              </p>
            </div>
          </RouterLink>
        </li>
      </ul>
    </div>
  </div>
</template>

<script setup>
import { getBrand } from '@/api/home'
const { computed, reactive, ref } = require('@vue/runtime-core')
const { useStore } = require('vuex')

const store = useStore()
// 新增的数据
const brand = reactive({
  id: 'brand',
  name: '品牌',
  children: [{ id: 'brand-chilren', name: '品牌推荐' }],
  goods: [],
})

// 获取品牌
getBrand(6).then(({ result }) => {
  brand.goods = result
})

// 导航栏
const list = computed(() => {
  const arr = store.state.cartgory.list.map((item) => {
    return {
      id: item.id,
      name: item.name,
      // 防止初始化没有children的时候调用slice函数报错
      children: item.children && item.children.slice(0, 2),
      goods: item.goods,
    }
  })
  arr.push(brand)
  return arr
})

// 当前划过的 id
const currentId = ref(null)
// 当 id 值发生变化，重新计算
// 找当当前 id 对应的商品
const currCategory = computed(() =>
  list.value.find((item) => item.id == currentId.value),
)
</script>
<style scoped lang="less">
.home-category {
  width: 250px;
  height: 500px;
  background: rgba(0, 0, 0, 0.8);
  position: relative;
  z-index: 99;
  .menu {
    li {
      padding-left: 40px;
      height: 50px;
      line-height: 50px;
      &:hover,
      &.active {
        background: @xtxColor;
      }
      a {
        margin-right: 4px;
        color: #fff;
        &:first-child {
          font-size: 16px;
        }
      }
    }
  }
  &:hover {
    .layer {
      display: block;
    }
  }
  .layer {
    width: 990px;
    height: 500px;
    background: rgba(255, 255, 255, 0.8);
    position: absolute;
    left: 250px;
    top: 0;
    display: none;
    padding: 0 15px;
    h4 {
      font-size: 20px;
      font-weight: normal;
      line-height: 80px;
      small {
        font-size: 16px;
        color: #666;
      }
    }
    ul {
      display: flex;
      flex-wrap: wrap;
      li {
        width: 310px;
        height: 120px;
        margin-right: 15px;
        margin-bottom: 15px;
        border: 1px solid #eee;
        border-radius: 4px;
        background: #fff;
        &:nth-child(3n) {
          margin-right: 0;
        }
        a {
          display: flex;
          width: 100%;
          height: 100%;
          align-items: center;
          padding: 10px;
          &:hover {
            background: #e3f9f4;
          }
          img {
            width: 95px;
            height: 95px;
          }
          .info {
            padding-left: 10px;
            line-height: 24px;
            width: 190px;
            .name {
              font-size: 16px;
              color: #666;
            }
            .desc {
              color: #999;
            }
            .price {
              font-size: 22px;
              color: @priceColor;
              i {
                font-size: 16px;
              }
            }
          }
        }
      }
    }
  }
}
</style>
